Finding the Fourth Proportional to 145,089.91, 216,456.69 and 137,242.63

Step by Step Solution

1. Step 1: Write the proportion equation
   145,089.91 : 216,456.69 = 137,242.63 : x
2. Step 2: Convert to fraction form
   145,089.91/216,456.69 = 137,242.63/x
3. Step 3: Cross multiply
   145,089.91x = 216,456.69 × 137,242.63
4. Step 4: Simplify right side
   145,089.91x = 29,707,083,648.20
5. Step 5: Solve for x
   x = 29,707,083,648.20/145,089.91
6. Step 6: Final answer
   x = 204,749.49